Morphological characterization of H aggregates in Langmuir-Blodgett films of pyridinium-dicyanomethanide dyes

Riccardo Ricceri, Chiara Neto, Alessandro Abbotto, Antonio Facchetti, Giorgio A. Pagani

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23 Scopus citations

Abstract

We investigated the aggregation of the pyridinium-dicyanomethanide dye 4-[5-(dicyanomethanido)-thien-2-yl]-N-(n-hexadecyl)pyridinium (C16H33-PDCNT), in transferred films obtained with the Langmuir-Blodgett (LB) technique; this behavior is an example for the formation of H* aggregates, which show strongly blue-shifted and sharp electronic absorption bands. Surface pressure-area isotherms are reported at T = 291 K. LB films were investigated by UV-vis spectroscopy and optical and atomic force microscopy in order to obtain information about the molecular structure of the aggregates. The molecule strongly absorbs in the visible region because of a charge-transfer band: the sharp peak at 422 nm is attributed to the formation of H* aggregates.

Original languageEnglish (US)
Pages (from-to)2149-2151
Number of pages3
JournalLangmuir
Volume15
Issue number6
DOIs
StatePublished - Mar 16 1999

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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